Ferroelectric liquid crystal devices
US5260699A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2310/065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a method of driving a ferroelectric liquid crystal display, a blanking pulse of width 2t.sub.s followed, after a delay of n.multidot.t.sub.s (where n is an integer), by a writing pulse of width t.sub.s and of opposite polarity to the blanking pulse are applied to successive row address lines at intervals of 2t.sub.s. Pairs of bipolar data pulses of width t.sub.s are applied to column address lines so that the data pulses coincide with the blanking pulse applied to the ith row and the writing pulse applied to row i-(n+1)/2 for odd values of n and to row 1-(n+2)/2 for even values of n. The data pulse amplitude may be varied in order to obtain variable grey levels in the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.